libpixel (suprisingly) still compiles, but depends on libraries in a very annoying manner that makes EuropaTools hard to compile. Also, I don't like stb_image_write.
Replace it with some hand-done structs and the simpler/faster/better `lodepng`.
PakReader won't read everything in ReadData(), it now only reads the header and TOC.
Files now need to be read in separately.
Adds progress bar to europa_pack_extractor.
Moved code around.